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Did LAX and ATL airports move 5 miles closer?

Did LAX and ATL airports move 5 miles closer?

Old Jan 9, 11, 1:12 am
  #1  
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Question Did LAX and ATL airports move 5 miles closer?

Just noticed LAX-ATL flight tomorrow gives 1941 miles. Yet the segment I flew last month was 1946 miles. Going back in my account summary to 2009 shows it was 1947 miles then.

Someone explain this to me please.

I want my 6 (+ medallion bonus) miles back!
amolkold is offline  
Old Jan 9, 11, 1:32 am
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Originally Posted by amolkold View Post
Just noticed LAX-ATL flight tomorrow gives 1941 miles. Yet the segment I flew last month was 1946 miles. Going back in my account summary to 2009 shows it was 1947 miles then.

Someone explain this to me please.

I want my 6 (+ medallion bonus) miles back!
Yes and MIA moved 20 miles away....
Dawgfan6291 is offline  
Old Jan 9, 11, 2:08 am
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It's those earthquakes we keep having
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Old Jan 9, 11, 3:16 am
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Originally Posted by TheMadBrewer View Post
It's those earthquakes we keep having
Can't they push us westward???
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Old Jan 9, 11, 6:38 am
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They probably changed the software for doing the calculations. There are two things that could cause differences, which might even account for the two changes you saw if they changed each at different times.

The first is fairly understandable: the database listing the exact spot on the earth's surface where the airport is was updated. Airports are pretty big so moving the surveyed location could easily change the calculations by a mile or two.

The second would be if they changed the reference datum for the earth. The earth isn't a perfect sphere, so an ellipsoid is used. But it isn't a perfect ellipsoid either, so you have to map the earths surface onto an ellipsoid to do distance calculations. A very typical reference datum to use is the WGS 84 datum. The FlyerTalk favorite Great Circle mapper uses this datum. But, maybe Delta changed their datum.
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Old Jan 9, 11, 6:57 am
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They keep adding Run ways, so yes they are closer.
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Old Jan 9, 11, 7:07 am
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Originally Posted by troyintn View Post
They keep adding Run ways, so yes they are closer.
I'm not sure if this was a joke, but it is almost certainly not the explanation. ATL and LAX both have east-west aligned runways. So they'd have to have extended the runways (considerably) to move the airport survey point by 5 miles.
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Old Jan 9, 11, 7:24 am
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Clearly, on one flight you took off to the east and the other to the west... ;-)

-=tg=-
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Old Jan 9, 11, 7:26 am
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http://gc.kls2.com/cgi-bin/gc?PATH=k...avy&MAP-STYLE=

This uses the GPS coordinates with the official Airport Reference Points.
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Old Jan 9, 11, 7:50 am
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if you are in the process of booking a flight in the future, and click on the flight number for details, it still says 1946 for ATL-LAX. but, if you look at flight status for a current flight, it says 1941.

looking at something the other direction from ATL -- BOS-ATL is 944 in flight status, and regularly posts at 946. this has been the case for some time..

Last edited by Seat1A; Jan 9, 11 at 8:20 am
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Old Jan 9, 11, 7:56 am
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I hope PVD does not move any closer to ATL because we will loose meal service it is currently 903 or 902 miles.
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Old Jan 9, 11, 9:02 am
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Aren't there official distances used and shared by all carriers for things like maximum permissible miles calculations? I recall looking these up on KVS, and they don't necessarily equal the mileage given in frequent flyer programs.
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Old Jan 9, 11, 9:05 am
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Originally Posted by amolkold View Post
Can't they push us westward???
Unfortunately it is Tectonic Subduction at work here. In 200,000 years ATL will be to LAX what SNA is today. Much quicker flights though.
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Old Jan 9, 11, 9:09 am
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I am actually shocked some up and coming accountant has not sold "rounding down" to the powers that be at all the airlines. Just shaving 10 miles from a route has a return of $$$$$$millions across the FF program over a few years.
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Old Jan 9, 11, 9:27 am
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ssssssssssssshhhh. be VERY quiet .......
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